Combined wired radio and space radio receiving system



Aug. 15, 1933. A. H. HOTOPP, JR

COMBINED WIRED RADIO AND SPACE RADIO RECEIVING SYSTEM Filed May 17 mokomkmo II 024 Patented Aug. 15, 1933 RADIU REi/n J Alfred ll. l'rlctopp, Caldwell, N. 5., assignor to Wired Radio, Inc., New York, N. Y., a Corporation of "fielaware Application I /ilay 1?, H32. Serial No. 611,834

4 Claims.

ill Q carrier frequency energy over commercial powe distribution networks to consumers are equipped with the proper receiving My invention is directed to providi g a receiving system for the selective rece space radio or wired radio signals whereby range of program entertainment can be available to a user without undue complication or multiplication of apparatus. There are several problems, however, to be encountered in producing a duplex radio system for the reception of either wired radio or space radio s nals.

One of these is that the frequency es employed in space radio broadcasting are much higher than those employed in carrier frequency or wired radio broadcasting. The carrier frequencies commonly employed in space broadcasting are of the order of filial-1560 kilocycles,

whereas carrier frequencies used wired radio co pti range up to 190 kilocycles. that apparatus especially designed for n ddln space radio frequencies will not he as efliciently responsive to wired radio frequencies.

One of the objects of my invention consis s in providing a radio receiver having a tunin oi cuit. parts of which are responsive to wired .o signals and other parts of which are responsive to space radio signals.

Another object consists in providing a duplex radio receiving circuit having elements which are automatically responsive to widely s arated frequency ranges for reception of particular frequency bands within such ranges.

A further object comprises provid combined wired radio and space radio receiver.

I accomplish these and other desirable objects in a novel radio receiving system having a ing system including elements of dnerent 11equency characteristics selectively cooperating with adjustable condensers for selection of e or wired radio or space radio signals for utilizaicon over a common amplifier and detector circuit.

(Cl. l79--2.5)

in the drawing 1 have diagrammatically represented one embodiment of the combined wired radio and radio receiver of my invention.

in this specification the term carrier frequency will he used to denote those frequencies usually in wired radio broadcasting and l ing within the range from super-audibility to 190 kilocycles, while the term radio frequency will be employed as denoting those frequencies lying within the range commonly used in space radio broadcasting from 500 kilocycles to 1500 lzilocycles.

My invention is directed to providing a radio receiving system having a tuning system comprisa filter network including dual sets of inouctances. One set of inductances is especially desi *IlECl for handling carrier frequencies, while the other set of inductances is especially designed for handling radio frequencies. These inductances are incorporated. in a filter circuit in a manner such that signals introduced into the carrier frequency inductances will be substantially unaffected hy the radio frequency inductances, and vice versa. Common tuning condensers are provided for use with both sets of inductances for reception of particular frequencies in either the carrier frequency or radio frequency range.

deferring to the drawing in detail, an antenna 1 and ground 2 comprise a space radio energy collectin system having an inductance 3 electromagnetically coupled to an inductance i. 'The inductance is connected through a variable condenser 11 and fixed capacitance to inductance 5 which is electromagnetically coupled to an inductance 6. The inductance 6 is connected through fixed capacitance l6 and variable condenser 15?. to inductance '7, electromagnetically CQULPlQL. to an inductance 8. The inductance 8 is connected through the fixed capacitance 17 and variable condenser 13 to the inductance 9 which is electromagnetically coupled to the inductance The condensers lll-l all have a common tance 29. Inductance 29 is connected with an in- 5 An inductance 26 is adjustably ductance 30 which is coupled to inductance 31. The inductance 31 is connected with an inductance 32 coupled with an inductance 33. Inductances 27-33 are respectively connected through high frequency choke coils 43-49 to the inductances 4-10. A resistor 34 is connected from one side of inductance 33 to the condenser 18 and forms a terminating impedance for a band pass filter comprising inductances 26-33 connected with power lines 23.

One side of inductance 33 and one side of inductance 10 are connected to the input of a radio frequency amplifier and detector 40 which has an output connected with an audio frequency amplifier 41 and translating device in the form of a loud speaker 42 connected therewith.

The inductances 26-33 are of values designed to tune, in combination with condensers 11-14, to discrete carrier frequencies transmitted over power lines 23. The inductances 3-10 are of a value small in comparison with inductances 26-33 and are designed to tune, in combination with the condensers 11-14,, to signals at space radio frequencies received over antenna 1.

In the operation of my system for the reception of carrier frequency signals, the switch 39 is closed thereby short-circuiting the antenna 1 to ground 2. The potentiometer 25 is adjusted to produce the desired signal level and the condensers 11-14 are adjusted in unison. The inductances 26-33 and condensers 11-14 in combination with the terminating impedance 34 then produce a band pass filter responsive to a selected carrier frequency program transmitted over power lines 23. The carrier frequency currents traversing the inductances 3-10 will be substantially undisturbed thereby since these inductances are of small value, for space radio frequencies, and are ineffective at carrier frequencies. The selected carrier frequency program is then amplified and detected and reproduced by the system 40-41-42.

In the operation of my system for the reception of space radio programs, the potentiometer 25 is adjusted to a zero signal level and the switch 39 is opened. The condensers 11-14 are then adjusted in unison to render the inductances 3-10, in combination therewith, responsive to a program at a desired space radio frequency. The space radio frequency currents will be prevented from passing to the inductances 26-33 by the high frequency choke coils 43-49 but will traverse circuits completed by the fixed capacitances 15-18 and thence to the radio frequency amplifier and detector 40. The program will then be further amplified by the audio frequency amplifier 41 and reproduced by loud speaker 42.

It will now be apparent that I have provided a novel system for the reception of programs from a plurality of sources. One of the principal advantages to be derived from my system resides in that but one set of tuning condensers is employed thereby obviating the necessity of a multiplicity of tuning components and switching arrange ments usually employed in systems of this kind.

Although I have shown a preferred embodiment of my combined wired radio and space radio receiver, it will be apparent that changes can be made therein but which will not depart from the intended scope of my invention. I do not therefore desire to be limited thereto except insofar as may be pointed out in the appended claims.

What I claim as new and original and desire to secure by Letters Patent of the United States is: 1. A radio receiving system comprising, wire lines for conveying carrier frequency energy, a potentiometer capacitively coupled to said wire lines, a space radio frequency energy collecting system, a switch for selectively rendering said space radio frequency energy collecting system operative or inoperative, an inductively coupled series of resonant circuits, each of said circuits including carrier frequency inductances and space radio frequency inductances, the carrier frequency inductances ofone resonant circuit being coupled with the carrier frequency inductances of another, and the space radio frequency inductances of one resonant circuit being coupled with the space radio frequency inductances of another,

the first resonant circuit of said series being coupled with said potentiometer and with said space radio frequency energy collecting system, an adjustable tuning element in each of said circuits,

and a utilization circuit operatively coupled with 1.05

said resonant circuits.

2. A radio receiving system in accordance with claim 1 including frequency isolation means connected between the carrier frequency inductances and the space radio frequency inductances of said resonant circuits.

3. A radio receiving system in accordance with claim 1 including space radio frequency condensers connected in each of said resonant circuits for causing space radio frequency energy to by-pass said carrier frequency inductances, and common control means for said adjustable tuning elements.

4. A radio receiving system comprising, conductors for conveying carrier frequency energy, a potentiometer operatively connected to said conductors, a space radio frequency energy collecting system, means for selectively rendering said space radio frequency energy collecting system operative or inoperative, a series of coupled resonant circuits, each of said circuits including carrier frequency inductances, and space radio frequency inductances, the carrier frequency inductances of one resonant circuit being coupled with the carrier frequency inductances of another and the space radio frequency inductances of one resonant circuit being coupled with the space radio frequency inductances of another, the first resonant circuit of said series being operatively connected to said potentiometer and to said space radio frequency energy collecting system, an adjustable tuning element in each of said circuits and a utilization circuit operatively connected with said resonant circuits.

ALFRED H. HOTOPP, JR. 

